This Reference Material can be used to qualify the Spectral Bandwidth, in the ultra-violet region of the spectrum (265 nm – 270 nm), of spectrophotometers with spectral bandwidths of 3 nm or less.
It is accepted for this purpose by most Pharmacopoeias and Standardisation Bodies, including:
Deutsches Arzneibuch (German Pharmacopoeia).
United States Pharmacopeia
American Society for Testing and Materials Therapeutic Goods Administration (Australia)